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run code in 300+ PHP versions simultaneously
<?php interface A {} interface B {} interface C {} interface AB extends A, B {} interface AC extends A, C {} interface BC extends B, C {} interface ABC extends AB, AC, BC {} $o = new class implements ABC {}; var_dump($o instanceof A); var_dump($o instanceof B); var_dump($o instanceof C); var_dump($o instanceof AB); var_dump($o instanceof ABC);
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(true) bool(true) bool(true) bool(true)

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